<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ajax请求页面</title>
</head>

<body>
    <button>点击</button>
</body>
<script>
    document.querySelector('button').addEventListener("click", function() {
        console.log("你好");
    })
</script>

</html>